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Help CenterMarine Service Lug Butterfly Valve With Mill Test Report, DN400 DN600
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As a leading manufacturer with a strong commitment to quality and reliability, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our premium Marine Service Lug Butterfly Valve series. Established in 2016, we have dedicated ourselves to engineering robust flow control solutions for demanding maritime applications worldwide. Our DN400 and DN600 lug butterfly valves are specifically designed to meet the rigorous challenges of shipboard systems, offering exceptional durability, leak-tight sealing, and ease of maintenance. With an annual export value reflecting our global trust and adherence to ISO9001 quality management systems, we ensure every valve delivers consistent performance for your critical marine operations.
Our marine lug butterfly valves are engineered for superior performance in seawater, ballast, cooling water, and other shipboard piping systems. The lug-style design allows for easy installation and removal from the pipeline without disturbing adjacent flanges, which is a significant advantage for maintenance and system modifications. The valve body is typically constructed from high-grade ductile iron or cast iron with advanced corrosion-resistant coatings, while the disc is made from stainless steel to withstand corrosive marine environments. The seat material, available in EPDM, NBR, or PTFE, is selected to ensure long-term sealing integrity against seawater and various chemicals.
Key Features and Technical Advantages:
- Robust Lug Design: Provides a secure, bolt-through connection for dead-end service or as a isolation point, enhancing system safety and flexibility.
- Corrosion Resistance: Special epoxy coatings or stainless steel construction options protect against saltwater corrosion, extending service life.
- Bidirectional Sealing: The precision-engineered seat ensures reliable sealing in both flow directions, crucial for reversible systems.
- Low Torque Operation: The streamlined disc design and low-friction seat minimize operating torque, allowing for smooth manual operation or smaller actuator sizing.
- Compact & Lightweight: Compared to gate valves of similar size, butterfly valves offer a space-saving and weight-reducing solution, ideal for ship design constraints.
- Maintenance-Friendly: The top-entry design permits easy inspection and replacement of internal components like the seat and disc without removing the valve body from the line.
Technical Specifications Table:
| Parameter | Specification |
|---|---|
| Size Range | DN400, DN600 (Other sizes customizable) |
| Pressure Rating | PN10, PN16, Class 150 (Standard) |
| Temperature Range | -10°C to +120°C (depending on seat material) |
| Body Material | Ductile Iron (GGG40), Cast Iron (GG25), Stainless Steel (CF8/CF8M) |
| Disc Material | Stainless Steel 316, Ductile Iron with Ni-plating |
| Stem Material | Stainless Steel 431/304 |
| Seat Material | EPDM (Standard for water), NBR, PTFE (for chemicals) |
| Operation | Lever, Gearbox, Electric/Pneumatic Actuator (Optional) |
| Face-to-Face | Per EN 593, ISO 5752, API 609 standards |
| Flange Standard | EN 1092-2, ANSI B16.5, JIS B2220 |
Benefits for Our Clients: By choosing our marine lug butterfly valves, you invest in system reliability and operational efficiency. The inclusion of a Mill Test Report (MTR) with each valve provides traceability and guarantees material conformity, which is often a mandatory requirement for ship classification societies like ABS, DNV, BV, or LR. This documentation simplifies your quality assurance and certification processes. Our valves contribute to reduced downtime due to their durability and easy maintenance, ultimately lowering the total cost of ownership over the vessel's lifecycle.
Backed by our ISO9001 certification and a proven track record of supplying to markets across North America, South America, Europe, Asia, Africa, and Oceania, Shanghai Zhibang Valve stands as a reliable partner for your marine valve needs. Our strategic shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing ensure efficient and flexible logistics to meet your project timelines. We invite you to experience the quality and performance of our DN400 and DN600 marine lug butterfly valves. Contact our sales team today to discuss your specific requirements, request detailed technical data sheets, or to place an order for a dependable solution that meets the high standards of the marine industry.
Frequently Asked Questions (FAQ):
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Q: What is the main advantage of a lug-style butterfly valve over a wafer-style for marine applications?
A: The lug design features threaded inserts on the valve body, allowing it to be bolted directly between two flanges without nuts on the opposing side. This permits the valve to be used as an isolation point or for dead-end service, which is a common requirement in shipboard systems for maintenance or section isolation. -
Q: Are these valves suitable for seawater service?
A: Yes, they are specifically designed for marine service. We offer corrosion-resistant materials like stainless steel discs and stems, along with specialized epoxy coatings (e.g., fusion-bonded epoxy) on iron bodies to protect against saltwater corrosion. The seat material (EPDM standard) is also highly resistant to seawater. -
Q: What is included in the Mill Test Report (MTR)?
A: The MTR is a certified document from the material manufacturer. It typically includes chemical composition analysis, mechanical property test results (tensile strength, yield strength, elongation), heat treatment details, and compliance statements with relevant international standards, providing full material traceability. -
Q: Can these valves be fitted with actuators for remote operation?
A: Absolutely. Our lug butterfly valves are designed with a standardized drive interface per ISO 5211, making them compatible with a wide range of electric, pneumatic, or hydraulic actuators. We can supply the valve as a manual unit or provide a complete actuated package. -
Q: What flange standards do your DN400 and DN600 valves comply with?
A: Our standard valves are manufactured to suit common international flange standards such as EN 1092-2 (PN10/16), ANSI B16.5 Class 150, and JIS B2220. Please specify your required flange standard when inquiring. -
Q: What is the typical delivery lead time for these valves?
A: Lead times vary based on order quantity, material specifications, and actuator requirements. For standard DN400/DN600 lug valves in common configurations, we generally maintain stock or offer competitive production schedules. Contact us for an accurate delivery estimate. -
Q: Do you offer custom coatings or special material grades for specific chemical services?
A: Yes, we provide customization options. This can include special internal/external coatings (e.g., rubber lining, Xylan coating), alternative stainless steel grades (e.g., duplex stainless steel), or specialized seat materials like Viton® for aggressive fluids. These are available upon request. -
Q: How do you ensure quality control during manufacturing?
A> Our production follows a strict quality management system certified to ISO9001. Each valve undergoes multiple inspections, including dimensional checks, pressure testing (shell and seat tests per API 598 or equivalent), and visual examination. The final MTR and test certificates are provided with the shipment.
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